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- We know that light is a wave based on how it behaves – it exhibits the same properties of other waves we have examined – it interferes with itself, it follows an inverse-square law for intensity (brightness), and so on.
This happens when an electron interacts with a light wave, but because the light wave is an oscillating field the electron moves to and fro and there is no net motion. If you could watch an electron as light passes by you'd see it start oscillating to and fro, but it's net position wouldn't change.
Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. [1] Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz.
- Introduction
- Sources
- Speed
- Other Characteristics
Light is a transverse, electromagnetic wave that can be seen by the typical human. The wave nature of light was first illustrated through experiments on diffraction and interference. Like all electromagnetic waves, light can travel through a vacuum. The transverse nature of light can be demonstrated through polarization. 1. In 1678, Christiaan Huyg...
Light is produced by one of two methods… 1. Incandescenceis the emission of light from "hot" matter (T ≳ 800 K). 2. Luminescence is the emission of light when excited electrons fall to lower energy levels (in matter that may or may not be "hot").
Just notes so far. The speed of light in a vacuum is represented by the letter c from the Latin celeritas— swiftness. Measurements of the speed of light. Ole Rømer (1644–1710) Denmark. "Démonstration touchant le mouvement de la lumière trouvé par M. Roemer de l'Académie des Sciences." Journal des Scavans. 7 December 1676. Rømer's idea was to use th...
The amplitude of a light wave is related to its intensity. 1. Intensityis the absolute measure of a light wave's power density. 2. Brightnessis the relative intensity as perceived by the average human eye. The frequency of a light wave is related to its color. 1. Coloris such a complex topic that it has its own section in this book. 2. Monochromati...
Some materials have an index of refraction that changes based on the polarization of light. This means that light in one polarization will bend more than light at the cross polarization. These materials are known as birefringent.
Brian Clegg. Published: October 25, 2021 at 10:00 am. Is light a wave or a particle? Neither: light is its own unique phenomenon – the outcome of an interaction between electrical and magnetic fields – and it behaves like both waves and particles. Most of us were taught at school that light is a wave. This is because it does things that waves do.
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Is light a wave?
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What happens when an electron interacts with a light wave?
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Light may change direction when it encounters objects (such as a mirror) or in passing from one material to another (such as in passing from air to glass), but it then continues in a straight line or as a ray.
